For the first question, yes, topic C will get the value of 30MB.
For the second question, log.retention.bytes only controls the segment log
file size, not the index. Typically, index file size is much smaller than
the log file. The index file of the last (active) segment is presized to
the max index size (defaults to 10MB). However, the size is trimmed as soon
as the segment rolls.
On Mon, Aug 19, 2013 at 9:22 AM, Paul Christian